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| 1 // Copyright (c) 2011 The Chromium Authors. All rights reserved. | |
| 2 // Use of this source code is governed by a BSD-style license that can be | |
| 3 // found in the LICENSE file. | |
| 4 | |
| 5 #include "chrome/browser/ui/touch/animation/screen_rotation_setter.h" | |
| 6 | |
| 7 #include "base/memory/scoped_ptr.h" | |
| 8 #include "chrome/browser/ui/touch/animation/screen_rotation.h" | |
| 9 #include "ui/gfx/compositor/layer.h" | |
| 10 #include "ui/gfx/interpolated_transform.h" | |
| 11 #include "views/layer_property_setter.h" | |
| 12 #include "views/view.h" | |
| 13 | |
| 14 namespace { | |
| 15 | |
| 16 static int SymmetricRound(float x) { | |
| 17 return static_cast<int>( | |
| 18 x > 0 | |
| 19 ? std::floor(x + 0.5f) | |
| 20 : std::ceil(x - 0.5f)); | |
| 21 } | |
| 22 | |
| 23 // A screen rotation setter is a LayerPropertySetter that initiates screen | |
| 24 // rotations in response to calls to |SetTransform|. Calls to |SetBounds| are | |
| 25 // applied to the layer immediately. | |
| 26 class ScreenRotationSetter : public views::LayerPropertySetter, | |
| 27 public ScreenRotationListener { | |
| 28 public: | |
| 29 explicit ScreenRotationSetter(views::View* view); | |
| 30 | |
| 31 // implementation of LayerPropertySetter | |
| 32 virtual void Installed(ui::Layer* layer) OVERRIDE; | |
| 33 virtual void Uninstalled(ui::Layer* layer) OVERRIDE; | |
| 34 virtual void SetTransform(ui::Layer* layer, | |
| 35 const ui::Transform& transform) OVERRIDE; | |
| 36 virtual void SetBounds(ui::Layer* layer, const gfx::Rect& bounds) OVERRIDE; | |
| 37 | |
| 38 // implementation of ScreenRotationListener | |
| 39 virtual void OnScreenRotationCompleted(const ui::Transform& final_transform, | |
| 40 const gfx::Rect& final_rect) OVERRIDE; | |
| 41 | |
| 42 private: | |
| 43 // This is the currently animating rotation. We hang onto it so that if a | |
| 44 // call to |SetTransform| is made during the rotation, we can update the | |
| 45 // target orientation of this rotation. | |
| 46 scoped_ptr<ScreenRotation> rotation_; | |
| 47 | |
| 48 // If a call to SetBounds happens during a rotation its effect is delayed | |
| 49 // until the rotation completes. If this happens several times, only the last | |
| 50 // call to SetBounds will have any effect. | |
| 51 scoped_ptr<gfx::Rect> pending_bounds_; | |
| 52 | |
| 53 // If a call to SetTransform happens during a rotation its effect is delayed | |
| 54 // until the rotation completes. If this happens several times, only the last | |
| 55 // call to SetTransform will have any effect. | |
| 56 scoped_ptr<ui::Transform> pending_transform_; | |
| 57 | |
| 58 // The screen rotation setter is associated with a view so that the view's | |
| 59 // bounds may be set when the animation completes. | |
| 60 views::View* view_; | |
| 61 | |
| 62 DISALLOW_COPY_AND_ASSIGN(ScreenRotationSetter); | |
| 63 }; | |
| 64 | |
| 65 | |
| 66 ScreenRotationSetter::ScreenRotationSetter(views::View* view) : view_(view) { | |
| 67 } | |
| 68 | |
| 69 void ScreenRotationSetter::Installed(ui::Layer* layer) OVERRIDE { | |
| 70 } | |
| 71 | |
| 72 void ScreenRotationSetter::Uninstalled(ui::Layer* layer) OVERRIDE { | |
| 73 if (rotation_.get()) | |
| 74 rotation_->Stop(); | |
| 75 } | |
| 76 | |
| 77 void ScreenRotationSetter::SetTransform(ui::Layer* layer, | |
| 78 const ui::Transform& transform) { | |
| 79 if (rotation_.get()) { | |
| 80 pending_transform_.reset(new ui::Transform(transform)); | |
| 81 } else { | |
| 82 float new_degrees, old_degrees; | |
| 83 if (ui::InterpolatedTransform::FactorTRS(transform, | |
| 84 NULL, &new_degrees, NULL) && | |
| 85 ui::InterpolatedTransform::FactorTRS(layer->transform(), | |
| 86 NULL, &old_degrees, NULL)) { | |
| 87 rotation_.reset(new ScreenRotation(view_, | |
| 88 this, | |
| 89 SymmetricRound(old_degrees), | |
| 90 SymmetricRound(new_degrees))); | |
| 91 } | |
| 92 } | |
| 93 } | |
| 94 | |
| 95 void ScreenRotationSetter::SetBounds(ui::Layer* layer, | |
| 96 const gfx::Rect& bounds) { | |
| 97 // cache bounds changes during an animation. | |
| 98 if (rotation_.get()) | |
| 99 pending_bounds_.reset(new gfx::Rect(bounds)); | |
| 100 else | |
| 101 layer->SetBounds(bounds); | |
| 102 } | |
| 103 | |
| 104 void ScreenRotationSetter::OnScreenRotationCompleted( | |
| 105 const ui::Transform& final_transform, | |
| 106 const gfx::Rect& final_bounds) { | |
| 107 // destroy the animation. | |
| 108 rotation_.reset(); | |
| 109 | |
| 110 if (pending_bounds_.get() && view_->layer()) { | |
| 111 // If there are any pending bounds changes, they will have already been | |
| 112 // applied to the view, and are waiting to be applied to the layer. | |
| 113 view_->layer()->SetBounds(*pending_bounds_); | |
| 114 pending_bounds_.reset(); | |
| 115 } else if (!final_bounds.IsEmpty()) { | |
| 116 // Otherwise we may have new bounds as the result of the completed screen | |
| 117 // rotation. Apply these to the view. | |
| 118 view_->SetBoundsRect(final_bounds); | |
| 119 } | |
| 120 | |
| 121 if (pending_transform_.get() && view_->layer()) { | |
| 122 // If there is a pending transformation, we need to initiate another | |
| 123 // animation. | |
| 124 SetTransform(view_->layer(), *pending_transform_); | |
| 125 pending_transform_.reset(); | |
| 126 } | |
| 127 } | |
| 128 | |
| 129 } // namespace | |
| 130 | |
| 131 views::LayerPropertySetter* ScreenRotationSetterFactory::Create( | |
| 132 views::View* view) { | |
| 133 return new ScreenRotationSetter(view); | |
| 134 } | |
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Chromium Code Reviews
Issue 8362006:
Reland r107720 - Enable the new layer animation framework. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src